New York: Actor Daniel Radcliffe has revealed that he used to go to shoot on "Harry Potter" sets while being drunk.

"I went into work still drunk. I can point to many scenes where I'm just gone. Dead behind the eyes. I have a very addictive personality. It was a problem," he said to a magazine, adding he did not drink at work.

"People with problems like that are very adept at hiding it. It was bad. I drank a lot and it was...nightly," he said. However, Radcliffe admits he no longer drinks, reports people.com."You either have to change something, or give into that shame," he said.